Short-term effects of exogenous growth hormone: effects on milk production and utilization of nutrients in muscle and mammary tissues of lactating ewes
1988
McDowell, G.H. | Leenanuruksa, D. | Niumsup, P. | Gooden, J.M. | Walt, J.G. van der | Smithard, R. (Sydney Univ., Camden (Australia). Dept. of Animal Husbandry)
Exogenous bovine growth hormone at a dose of 0.1 mg per kg liveweight increased yields of milk and milk constituents and milk fat content when injected over 5 days into ewes in mid-lactation. These changes in milk production were associated with changes in the supply to, and utilization of, nutrients by leg muscle and mammary tissues. During injection of growth hormone, blood flow to leg muscle and mammary tissues increased as did the calculated ratio of blood flow : milk yield. These changes in blood flow, together with changes in arterial concentrations and tissue utilization of key metabolites, were sufficient to account for the synthesis of extra milk and milk constituents.
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